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Table 2 Odds ratios of variables when included in regression models as categorical quartiles

From: Evaluating local vegetation cover as a risk factor for malaria transmission: a new analytical approach using ImageJ

Average size

    

Buffer (m2)

Quantile

OR (95% CI)

SE

p-value

50

(17.6,26.1]

1.34 (0.34 – 4.56)

0.65

0.744

 

(26.1,38.2]

2.55 (0.72 – 9.73)

0.66

0.156

 

(38.2,104]

1.86 (0.53 – 6.84)

0.65

0.339

100

(26.6,37.2]

3.50 (0.98 – 13.75)

0.67

0.061

 

(37.2,52.7]

1.91 (0.53 – 7.31)

0.66

0.330

 

(52.7,103]

2.10 (0.57 – 8.16)

0.67

0.268

500

(80, 99.7]

1.83 (0.53 – 6.64)

0.64

0.344

 

(99.7, 134]

1.35 (0.38 – 4.91)

0.65

0.643

 

(134, 286]

1.00 (0.28 – 3.59)

0.64

1.000

Area fraction

    

50

(5.8,9.8]

0.97 (0.27 – 3.43)

0.64

0.962

 

(9.8,17.1]

1.20 (0.34 – 4.24)

0.64

0.775

 

(17.1,38.5]

1.33 (0.39 – 4.65)

0.63

0.647

100

(6.7,11.4]

0.92 (0.26 – 3.17)

0.63

0.890

 

(11.4,16.6]

1.22 (0.34 – 4.46)

0.65

0.758

 

(16.6,36.9]

1.00 (0.28 – 3.51)

0.64

1.000

500

(7.9,12.4]

0.75 (0.21 – 2.57)

0.63

0.647

 

(12.4,17.3]

1.25 (0.35 – 4.57)

0.62

0.732

 

(17.3,37]

0.54 (0.15 – 1.90)

0.65

0.339

Total area

    

50

(355,614]

2.85 (0.80 – 11.03)

0.66

0.114

 

(614,1.19e + 03]

2.10 (0.57 – 8.16)

0.67

0.268

 

(1.19e + 03,2.96e + 03]

2.33 (0.65 – 8.95)

0.66

0.201

100

(2.12e + 03,3.57e + 03]

1.00 (0.28 – 3.51)

0.64

1.000

 

(3.57e + 03,5.15e + 03]

1.10 (0.31 – 3.93)

0.64

0.882

 

(5.15e + 03,1.15e + 04]

1.00 (0.28 – 3.51)

0.64

1.000

500

(5.97e + 04,9.36e + 04]

1.00 (0.28 – 3.51)

0.64

1.000

 

(9.36e + 04,1.28e + 05]

1.34 (0.38 – 4.89)

0.64

0.634

 

(1.28e + 05,2.79e + 05]

0.81 (0.23 – 2.87)

0.64

0.749

Count

    

50

(16,28]

0.38 (0.10 – 1.28)

0.64

0.125

 

(28,38]

0.41 (0.10 – 1.49)

0.67

0.184

 

(38,76]

0.92 (0.26 – 3.17)

0.63

0.890

100

(61,81]

0.36 (0.10 – 4.26)

0.65

0.117

 

(81,146]

0.28 (0.07 – 1.02)

0.67

0.059

 

(146,269]

0.62 (0.17 – 2.12)

0.63

0.444

500

(704,881]

0.82 (0.23 – 5.84)

0.63

0.752

 

(881,1.03e + 03]

0.73 (0.20 – 2.57)

0.64

0.621

 

(1.03e + 03,1.42e + 03]

0.82 (0.23 – 2.84)

0.63

0.752